Motor-controller.



Fati-med L APPLIOATIQN .FILED MAY 4 1998.

UNITED sTATEs 'PATENT oFnioE.

ALBERT J. Homoiv, or WHITE PLAINS, New vomi, As'sIGNon To TEE cUTLEn-HAMMER MFG. co., or MILWAUKEE, WIscoNsm, A concurren or wis- CONSI'N.

MOTOR-CONTROLLER.

i Spocication. uf Letters Patent.

Patented Aug. 25, 1914.

To all whom t may concern.'

Be it known that I, ALBERT J. HoRToN, a citizen of the United States,residing at lVhite Plains, in the county of `Westchester and State ofNew Y ork, have invented new andv useful Improvements inMotor-Controllers, of which the following is a full, clear, concise, andexact description, reference beingr had to the accompanying drawing,forming a part of this specification.

My invention relates to improvements in speed controllers for electricmotors It applies lmore particularly to speed controllers that areautomatically operated.

The object ot' my invention is to provide means whereby the controllermay be set to canse the motor to operate at different pre-determinedspeeds.

Other objects of my invention will hereinafter appear.

In accordance with the preferred forni of' my invention, I provide aspeed controller with means for adjusting the same to cause the motor tooperate at different predetermined speeds.

The accompanying drawing illustrates one simple form of my in vention.which I have worked out in practice. Ot'l course. other forms may bedeveloped.

The views in the aceoinpanyiimr drawings are as follows: Figure 1 is ageneral view of the controller, parts thereofl being shown in section.Fig. 2 is a detailed vieu of the adjusting pin. Fig. 3 is a view of thcadjusting; screw for the dash pot. i

As I have already said, in v invention may be embodied in variousdifferent forms.

, The one which is illustrated in the drawing has been selected as asimple illustration ot my invention. I shall inf-.v proceed to describethe device which is illustraucd in the accompanying drawing. it, otcourse, being' understood that various changes may be made therein inpractice.

The partsI of the controller are preferably mounted upon a base l. rl`hearm or switch Q. is pivoted upon a pin 3 protruding from the base l.This arni is adapted to sweep over a series oi contacts A'lconnected toan armature resistance and also a series of contacts G connected to afield resistance 7. The arm first passesl over the contacts 4, and thenover the contacts 6. lhile the ariu is passing over the contacts 4 italso engages a segg-nient 8, and while it is passing over the contacts Gengages a segment a. Ihe downward movement of the arm is limited by apin 10 mounted upon the base 1. The arm 2 is operated by' ay solenoidhaving' a winding 11, and a movable core 1Q. The movable core isconnected to the arm by means of an insulating link 13, 'which ispivoted to said arm and to the lower end of the said movable core. hesolenoid winding is Wound upon an insulating spool 14,. which is mountedwithin a magnetic frame 15, secured to the panel 1. The winding is heldin place in the frame by means of'a non-magnetic tube 16, which isinsert= ed through a hole in the bottom of the frame 15, and passesupward through the windinr and ts against a shoulder in a recess in theupper part oft the frame. This tube is held in place by means of ascrew17, threaded in the lower part of the frame, and having its head bearingagainst the lower end of the non-magnetici tube. The movable .core 12.slides within the non-magnetic tube. Within the upper end of the tube isan adjustable stationary core 18, which serves as a stop for limitingthe upward movement of the movable core. and

which always magnetically seals with the same at the limit of `itsmovement. The stationary core forms part of the magnetic circuit, and,as aforesaid` serves as a stop For the movable core. The stationarycoreis supported by an arm 19, pivoted upon a pin 20. The central portion ofvthe arm is provided with an opening Q1 through which extends a tube99., which 'is threaded into the stationaryv core. The upper 'end ot thetube Q2 is provided with a lange Q3, which bears upon the upper portionof the arm 19. The outer end of the arm 19 is provided with a sliding;pin 24 which is adapted to enter in one of the series of holes 25 in acurved bar 26 mounted upon the panel 1. The pin Q1 is pressed inwardlyby a springl 27. It will be observed that the arm 19 may be set indifferent positions by inserting the pin in different holes in the bar9.6. Ii" the position of the arm 1S) be thus changed, obviouslyT theposition of the stationary core 18 will be changed, and` hence theupward limit of the movement of the movable core will be variedl The arm19 may be, therefore, set to adjust the device so that the arm 2 will sto at any desired position. Through th stationary core 18 and the tube 22passes a non-magnetic pinv 28, the upper end of which is provided with ahead 29, that bears upon the flange 23. To a lug 30 on the arm 19 ispivoted a switch 31, the free end of which bears upon a contact 32,mountedA upon the panel 1. The purpose of this switch is to shortcircuit a resistance when it engages the contact 32. Then the movablecore is raised by the winding, it strikes the pin 28, which in turnopens the vswitch 31,`which causes a resistance to be inserted in thecircuit of the winding 11. The structure is such that this function willbe accomplished irrespective of the position in which the stationarycore may be set. The switch arm 2 is connected to the piston of a dashpot 33,v which is pivoted upon the base 1. The dash pot is provided withan adjusting screw 34 for adjusting the rate of travel of the dash pot.Of course, the dash pot may be of various forms. For convenience ofillustratiml have illustrated the screw 34 as provided with a V-shapedslot in its side.

.For the purpose of convenience of illustration I havediagranigiatically illustrated one arrangement of circuits that may beused with the controller. Of Course, various circuit arrangements may beemployed. I shall now proceed to describe the operation of thecontroller. Assume that the arm 19 is set in the position shown. If themain line switch 35 be closed, current will iow from the positive -lincthrough conductor-36, through switch arm 2, resistance 5, conductor 37,motor armature A, conductor 3S, to the negative line. Current will alsoiiow from the switch arm 2 to contact segment S, thence throughconductor 39, and field F of the motor to the negative line. The closureot the main circuit will also close the circuit through the solenoid,which circuit extends from the conductor 36, through conductor 10,winding 11, conductor 4-1, conductor 42, arm 19, switch 31, contact 32,conductor 43 and conductor Llto the negative line. The solenoid willraise the movable core 12, thereby moving the switch arm 2 upward, andremoving resistance 5 from the armature circuit. When the movable corestrikes the stationary core, the switch arm 2 will stop. lith the arm 19in the position shown in the drawing, only part of the armatureresistance will be cut out, and hence the motor will be operated at aslow speed. The core 12 will operate the pin 2S as it approaches thestationary core, which pin will open switch 31. The resistance 45 willthen be inserted in the circuit of the winding` 11, and this circuitwill extend through the conductor 40, winding l1, conductor 41, connductor 4G. resistance 45 and conductor 44 to the ne ative line. If it bedesired to set the contro ler for the motor to operate at a higherVspeed, the arm 19 may be raised so as to raise the stationary plunger.rl`hen the movable core will be permitted to rise higher and draw theswitch arm 2 over more of the contacts 5. The arm 19 may be set so highas .to permit the switch arm to pass first over -the contacts at andthen over the contacts G, in which event, after the armature resistance5 has been removed from circuit, the switch arm will insert theresistance 7 in the ield circuit, as it passes over the contacts G,thereby raising the speed of the motor to its highest degree. It will beobserved that I have pro-vided an automatic speed controller which maybe set to limit the operation of the motor to any desired predeterminedspeed. I

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. The combination with a solenoid operated speed regulator, of meansassociated therewith to limit the movement of said regulator at will toobtain any.' one of a number of different predetermined speeds oi themotor, the operating solenoid having a -inovable .plunger arranged Atoalways magnetically seal when the regulator reaches the limit of itsmovement.

2. The combination with a speed controller for electric motors, oi anoperating solenoid having a relatively stationary core,

and a movable core connected to said connectcd to said controllingmember, a sta` tionary core within said winding, one of said coresbeingadjustable relative to the other for limiting the range of movement ofsaid controlling,r membciyto cause the motor to operate at differentpredetermined speeds.

Ja In combination, a speed controlling rheostat, a solenoid having astationary core and a movable plunger. said movable plunger beingconnected to the movable element of said rheostat, said stationary corebeing arranged to serve as a stop ior said movable plunger, means forsetting said stationary core at different positions to vary the range ofmovement of the movable element of said rheostat.

The combination with an electromagnetically operatedspeed controller, ofmeans for adjusting the same at` will to canse the motor to operate at apredetermined speed,

and autonnltitarlly operated means for reducing the lionY of currentthrough the operating magnet after the controller has been operated.

G. In a controller tor regulating the speed of elect ie motors, thecombination witha controlling` member, of an electromagnetic winding, amovable core with in said winding and connected with said controllingmember, a st tionary core within said Winding serv- `ingas a stop forSaidy movable core, o ne of said core-s beingadjustable relative to theother to limit the movement of Said con,- trolling member, and meaneAfor reducing the non' of current through Said winding when saidcontrolling` member has reached the limit of its travel,

7. In combination, a speed controlling rheostat, a solenoid having astationary core and a movable core, said movable core being connected tothe movable element of said rheostat, said stationary core beingarranged to serve as a stop for said movable core, means for setting theStationary core at dijferent positions to vary the range of movement ofthe movable element of said rheostat, and means for reducing the How ofcurrent through said solenoid after said rhcostat has been operatedirrespective of the position ot said Stationary core.

S. ln a controller 'for regulating the Spoed of electric motors, thecombination with a controlling member, of a solenoid having a movableplunger connected with said conw trolling member, and a stationary plugserving as a stop for said movable plunger, a switch adapted to beoperated by said plunger upon reaching.r ita final position, a resistance for said solenoid controlled by said switch, and moans foradjusting the position of said plug and said switch to cause the motorto operate at diilerent predetermined speeds.

f). In a yepeed controller for electric motors, the combination with a.controlling member. a solenoid havinga movable core connected with saidcontrolling member, and an adjustable plug tor limiting the movement otsaid movable core, a lever supporting said adjustable plug, means -lorlocking said lever in di'llerent. positions, a switch carried by saidlever. a resistance for said solenoid controlled by Said switch, andmeans actuated by said core upon reaching its final position for openingsaid switch.

l0. Vln a speedcontroller for electric motors. in eonibimition` aresistancin a controllingv i'nen'iber therefor. a solenoid having arelatively stationary core and a movable core connected to saidctmtrollingmember for operating` the same. and means including! saitlrelatively stationary core for limiting the movement oft saidcontrolling mem# ber and va rying the range ot movement thereof at willto cause the motor to be automatically brought u to any one of a numberof dilterent nedetermined speeds, said movable core an said stationarycore being adapted to always magnetically seal when said controllingmember reacties the limit of its movement.

ll. ln a Speed controller for electric motors, in combination. an'armature resistance a field resistance. a single. movable member forcontrolling both oi said resistances, a solenoid for operatingsaidcontrolling member, said solenoid having a vrelatively stationarycore and a movable :ore connected to Said controlling member, and meansincluding said relatively stationary core for limiting` the movement ofsaid movable core electromagnet, a movable core and a St(- tionary coremounted therein, said movable core being connected to said `controllingmember. aid stationary core being arranged to limit' the movement -ofsaid' movable core,

and means For adjusting one of said cores relative. to the other `forvarying the range of movement ot said controlling member.

13. The combination with a speed controller tor electric motors of anoperating solenoid having a relatively stationary core and a movablecore connected to said controller. means includingT said relativelystationary core for limiting the movement of said controller andvarying:y the range oi movement thereof. said movable core al waysabuttingl against said stationary core upon energization of saidsolenoid, and means t'or autonnlticallrT reducing the How of currentthrough said solenoid upon said movable core reaching the limit' of itsmovement.

1,4. ln a speed controller tor electric motors` in combination. aresistance. a controlling element therefor, an operating Winding havinga relatively stationary core, and a movable core connected to saidcontrolling element. means including said relatively Stationary core`for limiting the mo'vei ment ot said movable .core and varying therange ot movement thereof at nill to cause said resistance to be variedto obtain any one of a' number of differenty predetermined v l speeds otthe. motor upon energization of,

said winding, and a switch adapted to be operated upon said controllingelement reaching anv predetermined final position, to insert resistancein circuitwith said Winding` to reduce the flow of current therethrough.

151 In a speed contoller for electric motors, the combin'iition, with ncontrolling member, of a/ solenoid Windinghzrzingiu movable Cyr/econnecteclffwith"said Q'ontroli lnodffieinber, an adjustable plug Withinsaid Wgizding for limiting the movement of said movable core, and anadjustable lever supporting said plug and adapted to be lockedindifferent positions to cause said plug to stop said plunger in any oneof a number of different positions io cause themotor to operate atdifferent predetermined speeds.

Inu/Witness whereof, I have hereunto subscribed my name in the presenceof two Wtnesse's.

ALBERT J. HORTON.

fitnessesz W. C. MARGERSON, BEATRICE MIRVIS.

